Manganese, Iodine and Sulfide Concentrations and Peroxide to Oxygen Ratio Measured during the U.S. JGOFS Arabian Sea Process Study

Eleven cruises took place aboard the R/V Thomas G. Thompson for about sixteen months from October 1994 until January 1996. These cruises provided seasonal coverage of the annual monsoon and inter-monsoon cycles in the area southeast of Oman - from where the cruises were staged.

The monsoons of the Arabian Sea drive a uniquely intense carbon cycling system, and it is the goal of JGOFS to better understand the role of the oceans in global carbon cycling. Manganese (Mn), iodide (I-), total iodine, and sulfide (SO4--) concentrations were measured from water samples collected by the CTD rosette bottle sampler at various depths on cruise TTN-045. Hydrogen peroxide to oxygen ratio was measured by voltammetry where iodide and/or nitrite concentration was high.